This is the wireless speaker system that plays music in three different rooms without hardwiring or requiring proximity to a power outlet. A smartphone, iPod, or tablet computer connects to the included base station that wirelessly streams music via a 2.4 GHz signal to the three rechargeable satellite speakers up to 115' away. Music devices can connect wirelessly to the base via Bluetooth (up to 25' away) or using the included 3.5 mm cable. Each speaker's 2 1/2" driver is directed upward to enable broad sound projection with deep bass and clear, vibrant treble. The 4" cu. speakers enable unobtrusive set up on a desk or bookshelf and their rechargeable batteries provide up to six hours of music after a 3 1/2- hour charge on the base. Each speaker has volume buttons. Base plugs into AC. Base: 18" L x 7" D. (2 lbs.)